If your destination is east of Village Center Drive (shown in blue), use Yorba Linda Boulevard/Weir Canyon Road from the Riverside Freeway to get to and from your destination. If your destination is west of Village Center, use Imperial Highway to the greatest extent possible to get to and from your destination.
Mouth ulcers are caused by many disorders. These include: 1  Canker sores. 2  Gingivostomatitis. 3  Herpes simplex (fever blister). 4  Leukoplakia. 5  Oral cancer. 6  Oral lichen planus.
Canker sores can, in some instances, contain blood, in which case they could be considered a type of blister. Oral ulcers are usually the result of an overgrowth of certain types of microorganisms in the mouth. These microorganisms can cause lesions and blisters to form in the mouth.